commit 62715ec832c7229b677415901e98799124efb023
author Oleg Nesterov <oleg@tv-sign.ru> Tue Jul 17 14:37:54 2007 -0700
committer David S. Miller <davem@davemloft.net> Tue Jul 17 14:37:54 2007 -0700
tree 29c3699ba537e65074c72e7f3ca20f960766a109
parent c1e49e3a1b37e5fbeb6923d4a950ec1fea8388fa

[SPARC64]: Kill bogus set_fs(KERNEL_DS) in do_rt_sigreturn().

From: Oleg Nesterov <oleg@tv-sign.ru>

Signed-off-by: David S. Miller <davem@davemloft.net>

arch/sparc64/kernel/signal.c

diff --git a/arch/sparc64/kernel/signal.c b/arch/sparc64/kernel/signal.c
index 203e873..fb13775 100644
--- a/arch/sparc64/kernel/signal.c
+++ b/arch/sparc64/kernel/signal.c
@@ -289,9 +289,7 @@
 	struct rt_signal_frame __user *sf;
 	unsigned long tpc, tnpc, tstate;
 	__siginfo_fpu_t __user *fpu_save;
-	mm_segment_t old_fs;
 	sigset_t set;
-	stack_t st;
 	int err;
 
 	/* Always make any pending restarted system calls return -EINTR */
@@ -327,20 +325,13 @@
 		err |= restore_fpu_state(regs, &sf->fpu_state);
 
 	err |= __copy_from_user(&set, &sf->mask, sizeof(sigset_t));
-	err |= __copy_from_user(&st, &sf->stack, sizeof(stack_t));
-	
+	err |= do_sigaltstack(&sf->stack, NULL, (unsigned long)sf);
+
 	if (err)
 		goto segv;
-		
+
 	regs->tpc = tpc;
 	regs->tnpc = tnpc;
-	
-	/* It is more difficult to avoid calling this function than to
-	   call it and ignore errors.  */
-	old_fs = get_fs();
-	set_fs(KERNEL_DS);
-	do_sigaltstack((const stack_t __user *) &st, NULL, (unsigned long)sf);
-	set_fs(old_fs);
 
 	sigdelsetmask(&set, ~_BLOCKABLE);
 	spin_lock_irq(&current->sighand->siglock);